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// ==UserScript==
// @author maxph5555
// @name YouTube Auto 100 Volume
// @description Automatically increase volume to 100%
// @include *.youtube.com/watch*
// @version 1.0
// ==/UserScript==
unsafeWindow.onYouTubePlayerReady = function (playerId) {
location.href = 'javascript:void((function () { document.getElementById("movie_player").setVolume(100); })())';
};